US7969542B2ActiveUtilityA1

Liquid crystal panel and liquid crystal display apparatus

Assignee: NITTO DENKO CORPPriority: Nov 27, 2006Filed: Nov 15, 2007Granted: Jun 28, 2011

Est. expiryNov 27, 2026(~0.4 yrs left)· nominal 20-yr term from priority

Inventors:Kentarou Takeda Junichi Nagase

G02F 2413/04G02F 2202/28G02F 2413/12G02F 1/133742G02F 2202/40G02F 1/133634G02F 2413/06

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Claims

Abstract

A liquid crystal panel includes a liquid crystal cell having a liquid crystal layer containing liquid crystal molecules that are vertically aligned in an absence of a voltage; a first optical compensation layer having a relationship of Nz =1 to 2.5 and a relationship of Re 1 (380) <Re 1 (550) <Re 1 (780); a second optical compensation layer having a relationship of nx =ny >nz and a relationship of Re 2 (380) >Re 2 (550) >Re 2 (780); a first polarizer; a third optical compensation layer having a relationship of Nz =1 to 2.5 and a relationship of Re 3 (380) <Re 3 (550) <Re 3 (780); a fourth optical compensation layer having a relationship of nx =ny >nz and a relationship of Re 4 (380) >Re 4 (550) >Re 4 (780); and a second polarizer wherein: the first optical compensation layer, the second optical compensation layer, and the first polarizer are placed on one side of the liquid crystal cell; and the third optical compensation layer, the fourth optical compensation layer, and the second polarizer are placed on the other side of the liquid crystal cell.

Claims

exact text as granted — not AI-modified

1. A liquid crystal panel, comprising:
 a liquid crystal cell having a liquid crystal layer containing liquid crystal molecules that are vertically aligned in an absence of a voltage; 
 a first optical compensation layer having a relationship of Nz=1 to 2.5 and a relationship of Re 1 (380)&lt;Re 1 (550)&lt;Re 1 (780); 
 a second optical compensation layer having a relationship of nx=ny&gt;nz and a relationship of Re 2 (380)&gt;Re 2 (550)&gt;Re 2 (780); 
 a first polarizer; 
 a third optical compensation layer having a relationship of Nz=1 to 2.5 and a relationship of Re 3 (380)&lt;Re 3 (550)&lt;Re 3 (780); 
 a fourth optical compensation layer having a relationship of nx=ny&gt;nz and a relationship of Re 4 (380)&gt;Re 4 (550)&gt;Re 4 (780); and 
 a second polarizer wherein: 
 the first optical compensation layer, the second optical compensation layer, and the first polarizer are placed on one side of the liquid crystal cell; 
 the third optical compensation layer, the fourth optical compensation layer, and the second polarizer are placed on the other side of the liquid crystal cell; and 
 the first optical compensation layer and the second optical compensation layer, and the third optical compensation layer and the fourth optical compensation layer are placed in a symmetric positional relationship with respect to the liquid crystal cell. 
 
     
     
       2. A liquid crystal panel according to  claim 1 , wherein:
 the first optical compensation layer, the second optical compensation layer, and the first polarizer are placed on one side of the liquid crystal cell in the stated order from the liquid crystal cell; and 
 the third optical compensation layer, the fourth optical compensation layer, and the second polarizer are placed on the other side of the liquid crystal cell in the stated order from the liquid crystal cell. 
 
     
     
       3. A liquid crystal panel according to  claim 1 , wherein:
 the second optical compensation layer, the first optical compensation layer, and the first polarizer are placed on one side of the liquid crystal cell in the stated order from the liquid crystal cell; and 
 the fourth optical compensation layer, the third optical compensation layer, and the Second polarizer are placed on the other side of the liquid crystal cell in the stated order from the liquid crystal cell. 
 
     
     
       4. A liquid crystal panel according to  claim 1 , wherein the first optical compensation layer and the third optical compensation layer each have a photoelastic coefficient of 70×10 −12 (m 2 /N) or less. 
     
     
       5. A liquid crystal panel according to  claim 1 , wherein the first optical compensation layer and the third optical compensation layer each have a relationship of Re(780)/Re(550)&gt;1.1. 
     
     
       6. A liquid crystal panel according to  claim 1 , wherein the first optical compensation layer and the third optical compensation layer are formed of one of a cellulose-based material and a polyester-based material. 
     
     
       7. A liquid crystal panel according to  claim 1 , wherein the first optical compensation layer and the third optical compensation layer are formed of a material having a non-aromatic cyclic structure and an ester group. 
     
     
       8. A liquid crystal panel according to  claim 1 , wherein the second optical compensation layer and the fourth optical compensation layer each have a relationship of Re(780)/Re(550)&lt;0.95. 
     
     
       9. A liquid crystal panel according to  claim 1 , wherein the second optical compensation layer and the fourth optical compensation layer each have a thickness direction retardation Rth of 20 nm or more. 
     
     
       10. A liquid crystal panel according to  claim 1 , wherein the first optical compensation layer and the third optical compensation layer are polymer films stretched in a width direction. 
     
     
       11. A liquid crystal display apparatus, comprising the liquid crystal panel according to  claim 1 .

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